Heat dissipation device

ABSTRACT

A heat dissipation device includes a heat sink, a fan including a fixing member, and a positioning member. The heat sink includes a supporting portion and a number of fins. The supporting portion defines a positioning hole including an access hole and a locking hole communicating with the access hole. The positioning member includes a neck connected to a bottom of the fan, and a head connected to a bottom end of the neck and having a diameter greater than a diameter of the neck. When fixing the fan, the head extends through the access hole, the fan is slid to move the neck into the locking hole, and the fixing member is fixed to the heat sink.

BACKGROUND

1. Technical Field

The present disclosure relates to a heat dissipation device.

2. Description of Related Art

Many fans are mounted to heat sinks using screws, which is time consuming.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is an exploded, isometric view of an embodiment of a heat dissipation device, wherein the heat dissipation device includes a heat sink, a fan, and three positioning members

FIG. 2 is an inverted view of the fan and the positioning members of FIG. 1.

FIG. 3 is an assembled view of FIG. 1.

FIG. 4 is a cross-sectional view of FIG. 3, taken along the line IV-IV.

FIG. 5 is an enlarged view of the circled portion V of FIG. 4.

FIG. 6 is similar to FIG. 4, but shows another using state.

DETAILED DESCRIPTION

The disclosure, including the accompanying drawings, is illustrated by way of example and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one.

Referring to FIGS. 1 and 2, an embodiment of a heat dissipation device includes a heat sink 10, a fan 20, and three positioning members 30.

The heat sink 10 includes two supporting portions 11 and a plurality of fins 12 positioned between the supporting portions 11. Two positioning holes 112 are defined in a top of one of the supporting portions 11 and one positioning hole 112 is defined in and a protrusion 113 is formed on a top of the other supporting portion 11. The protrusion 113 defines an engaging hole 1131. Each positioning hole 112 is keyhole shaped with the wider portion comprised of an access hole 1121, and the narrower portion comprised of a locking hole 1123. The positioning holes 112 are oriented such that they can simultaneously receive the corresponding positioning members 30. A surface of the protrusion 113 facing the positioning hole 112 in the same supporting portion 11 slantingly extends down and toward the positioning hole 112 from a top of the protrusion 113.

Each positioning member 30 includes a neck 31 connected to a bottom of the fan 20, and a round head 32 connected to a bottom end of the neck 31. The diameter of the head 32 is greater than that of the neck 31 and that of the locking hole 1123, but less than that of the access hole 1121.

The fan 20 defines a depressed portion 21 in a top surface of the fan 20, and includes a fixing member 40.

Referring to FIG. 5, the fixing member 40 includes a base 41 fixed in the depressed portion 21, a shaft 42 slidably extending through the base 41, an operation portion 421 connected to a top end of the shaft 42 and positioned upon the base 41, a round inserting portion 423 connected to a bottom end of the shaft 42, and a spring 43 fitted about the shaft 42. The fan 20 defines a receiving hole 412 extending through a top side of the base 41 and the bottom of the fan 20. The shaft 42 is slidably mounted in the receiving hole 412. A blocking portion 414 is formed at the top of the base 41 around the shaft 42. The diameter of the inserting portion 423 is greater than the diameter of the shaft 42. Opposite ends of the spring 43 respectively abut against an inner surface of the blocking portion 414 and a top of the inserting portion 423. The inserting portion 423 can extend out of the receiving hole 412 through the bottom of the fan 20.

Referring to FIGS. 3 to 6, in assembly, the heads 32 extend through the access holes 1121 from top to bottom. The fan 20 is rested on the supporting portions 11. The fan 20 is slid to make the neck 31 move to the locking holes 1123. The inserting portion 423 slidably abuts against the slanted surface of the protrusion 113 and slides to the engaging hole 1131. The inserting portion 423 withdraws into the receiving hole 412, and the spring 43 is deformed. When the necks 31 engage in the corresponding locking holes 1123, the inserting portion 423 is aligned with the engaging hole 1131. The spring 43 is restored and biases the inserting portion 423 to be inserted into the engaging hole 1131, thereby fixing the fan 20 on the heat sink 10. The heads 32 are blocked by the bottom of the supporting portions 11. The operation portion 421 is received in the depressed portion 21.

In disengaging the fan 20 from the heat sink 10, the operation portion 421 is pulled away from the heat sink 10, to disengage the inserting portion 423 from the engaging hole 1131. The fan 20 is then slid to allow the necks 31 to move to the access holes 1121. Therefore, the fan 20 is readily removed from the heat sink 10.

It is believed that the present embodiments and their advantages will be understood from the foregoing description, and various changes may be made thereto without departing from the spirit and scope of the description or sacrificing all of their material advantages, the examples hereinbefore described merely being exemplary embodiments. 

What is claimed is:
 1. A heat dissipation device, comprising: a heat sink comprising a supporting portion and a plurality of fins, the supporting portion defining a positioning hole, the positioning hole comprising an access hole, and a locking hole communicating with the access hole and less than the access hole in width; a fan comprising a fixing member; and a positioning member comprising a neck connected to a bottom of the fan, and a head connected to a bottom end of the neck and having a diameter greater than a diameter of the neck; and wherein, when fixing the fan, the head extends through the access hole, the fan is slid to make the neck move into the locking hole hole, the fixing member is then fixed to the heat sink, to fix the fan to the heat sink.
 2. The heat dissipation device of claim 1, wherein a diameter of the head is less than the width of the access hole, but greater than the width of the locking hole, when the neck is engaged in the locking hole, the head abuts against a bottom of the supporting portion.
 3. The heat dissipation device of claim 1, wherein a protrusion protrudes from the supporting portion and defines an engaging hole, the fixing member comprises an inserting portion to detachably engage in the engaging hole.
 4. The heat dissipation device of claim 1, wherein the fan defines a depressed portion, the fixing member is mounted in the depressed portion.
 5. The heat dissipation device of claim 4, wherein the fixing member comprises a base fixed in the depressed portion, a shaft slidably extending through the base, and a spring fitted about the shaft, and an inserting portion connected to a bottom end of the shaft, the fan defines a receiving hole extending through a top side of the base and a bottom of the fan, a blocking portion is formed at the top of the base, opposite ends of the spring respectively abut against an inner surface of the blocking portion and the inserting portion, the spring biases the inserting portion to extend out of the receiving hole through the bottom of the fan to engage in an engaging hole defined in the supporting portion.
 6. The heat dissipation device of claim 5, wherein the fixing member further comprises an operation portion connected to a top end of the shaft, facilitating pull the inserting portion out of the engaging hole.
 7. The heat dissipation device of claim 6, wherein when the inserting portion is engaged in the engaging hole, the operation portion is received in the depressed portion. 